Prehistoric Horns are a type of Mutation that can be added to a waja either during custom creation or through use of Prehistoric Horns DNA. Prehistoric Horns can also be obtained randomly using a Mutation Pear. When creating a custom with Prehistoric Horns, or adding them to an existing waja with a DNA, you may choose their color.
The mutation that is now known as Prehistoric Horns was originally called Senz Horns (created for and named after Senz). At a certain point after the renaming of the mutation, they also underwent a redrawing on at least the Egyptian breed. Here is an example of the way they used to look.